you need to do a neck xray to rule out cervical spondylosis
, as the neck supplies the nerves to the hand.
you also need to do ct scan of brain to rule out if any stroke symptoms or mass compressing resulting you to have the symptoms
medical conditions like thyriod disease, endocrine disease
, inflammatory condition , nervous disorders need to be ruled out
if you are on any medication, it could be a side effect of the drug you are taking.
need to do normal blood test
as well as hiv test
to rule out if have infection or not
would suggest be seen by a physician for through follow up and treatment.
hope have helped to answer your query